Metal-punching machinery.



G. P. THOMAS.

METAL PUNCHING MACHINERY.

7 APPLICATION FILED JUNE 29,1914. 1,179,477. Patented Apr. 18,1916.

2 SHEETSSHEET I.

FIGJ- INVENTOR I my 9 ggfmm G WITNESSES INVENTOR GEORGE PAUL THOMAS, 0FGLENSHAW, PENNSYLVANIA.

METAL-PUNCHING MACHINERY.

Specification of Letters Patent.

Patented Apr. 18, 1916.

Application filed June 29, 1914. Serial No. 847,977.

To all whom it may concern: J

Be it known that I, GEORGE PAUL THOMAS, residing at Glenshaw, in thecounty of Allegheny and State of Pennsylvania, a citizen of the UnitedStates, have invented or discovered certain new and useful Improvementsin Metal-Punching Machinery, of which improvements the following is aspecification.

My invention consists in improvements in metal-ptmching machinery andspecifically in an automatic oiler for the punches.

In the use of metal-punching machinery it is necessary to proper andeconomic operation that the cutting surfaces of the punches themselvesshall be coated with oil. The oiling of these surfaces has heretoforebeen done by hand. In the use particularly of multiple punchingmachinery, where there may be a great' number of punches arranged sideby side in the punching head in transverse row, and when-the punchinghead is reciprocated at a large number of strokes per minute, it ispractically 1mpossible to keep the punches properly lubricated, so longas lubrication is performed by the manual work of attendants.

My present invention is designed to dispense with hand lubrication andprovides for the efficient oiling of the punches automatically.

The invention is illustrated in the accompanying drawings in which-Figure ,1 is a view in vertical section through a metal punch equippedwith my automatic oiler, and Fig. 2 is av view on larger scale showing aportion of the mechanism of Fig. 1.

Referring first to Big. 1, the machine consists essentially of an anvilmember 1, and a punching head 2, the anvil being provided with a recess3 and the punching head with a punch 4. The punching head reciprocateswhile the piece of work A is intermittently fed across the face of theanvil, and by the conjoint action of the parts 3 and 4 punching isefiected.

An oil supply 5, which may be a rece tacle in the form of a .pipe orotherwise, is provided with a discharge pipe 6, terminating in a nozzle7, which nozzle isclosed by a gravity check valve 8. These parts are soarranged that the nozzle 7 extends immediately above a lateral armborneby the punch when the punch is atthe upper end of its stroke, andthe stem of the gravity valve 8.

extends so far downward that when the i punching head rises to the upperend of its stroke the lateral arm referred to, engaging the valve stem,w1ll open the valve and per- Init a discharge of oil to a suitablereceptacle in the arm. The arm itself is provided with a duct throughwhich oil may pass to the punch and particularly to those surfaces whichrequire lubrication.

In'regard to the arm, its specific construction and the functioning ofparts which it may or may not carry are quite immaterial to thisinvention.

In a copending application filed June 29, 1914, Serial No. 847,976, Ihave described and claimed a particular kind of chuck for securing thepunch to the punching head, and in that particular kind of a chuck thereis a lateral extension, and that lateral extension may be takenadvantage of, to obtain the benefits of this invention. Fig. 2 showssuch an arm 9 extending laterally with respect to the axis of punch 4.This arm 9 is provided with a bearing surface in the form of a cup 10,from which-leads a duct 11. As the punching head reciprocates, thebottom surface of cup 10,.bearing against the stem of valve 8, opens thevalve, and a discharge of oil flows into the cup.;,;' From this cup thedischarged oil passes through duct 11 and through suitable chambers orducts to the tool 4. The tool 4 is borne in a seat in a casing andextends/through an orifice in that casing. \Vicks 12;;may be providedextending from the oil duct within the casing across the perimeterof,this orifice and against the surface oftheintroduce-d 1 punch. Thebody' of the punch"itself may be grooved as at 13 to permit themoreready flow of oil from the wicks 12to the cutting surfaces of the punch.

When a punching machine is standing idle between jobs the punching headis raised, and of course when the punching head is raised the arm 9 isholding the valve 8 open.

I provide a second valve in the line of flow of oil from the source ofsupply 5 through thepipe 6, which second valve is operated through anarm 14 by the punching head itself, and so operated that when the headrises to the upper end ofits stroke this second valve is closed. The twovalves accordingly cooperate and, while valve .8 at the point ofdischarge opens whenthe head rises, the second is by the same movementclosed. Accordingly, there is with each loo stroke of the head adischarge of a small charge of oil, but there cannot be a discharge ofany more oil than'a certain small quantity; Furthermore, While thepunching head continues in elevated position the second valve continuesin closed position, shuttingoff further flow of oilto the punch. Whenthe punch descends again that second valve is opened, and with thereturn of the punch to its raised position there is a new dischargeof ameasured quantity of oil. I claim as my invention:

\ 1. In a metal-punching machine, the combination of .a reciprocatinghead and a stationary oil receptacle, a laterally extending borne onsaid head and provided With an oil duct, and a valve in said oilreceptacle shifted by reciprocation of said head and controllingdischarge of oil from said receptacle to the duct in said arm.

2. In a metal punching machine the combination of a'reciprocating head,an oil supply provided With a discharge orifice, two valves controllingthe flow of oil from said supply through said discharge orifice, and cmeans Wherebythe punching head in its reciprocation opens the two saidvalves in alternation.

lln testimony whereof I have hereunto set

